Hammer-drill.



W. PRBLLWITZ.

HAMMER DRILL.

APPLIOATION ILBD PII-113.15. 1909.

Patented Nov. 15, 1910.

iunrriin srarns rarnnr ernten.

WILLIAM PRELLWITZ, OIEI EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

HAMMER-DRLL.

Specification of'Lettcrs Patent.

Application led February 15, 1530521. Serial No. 478,112.

. and State of Pennsylvania,'have invented a new and useful vImprovement in Hammer- Drills, of which the .following is a specification.

This invention relates to hammer Vdrills and has for its object toprovide a novel construction at the front end of the drill which will be articularly well adapted for feeding fluid) steel of common form, fluid-tight connections being provided for the pressure fluid feeding chamber and also between the drill -steel and its chuck.

In the accompanying drawings, Figure 1 representsjthe front end of a hammer drill embodying the invention, the parts being shown partially in side elevation and -parl tially in longitudinal'central section; the

drill steel being shown in dotted lines in its operative position, Fig. 2 is a detail longitudinal central section'at the front end of the drill showing the drill steel in full lines in its position within its chuck, Fig. 3 is a front end view of the drillwith the drill steel removed and a portion of the handle broken away, andFig. 4 is a transversesection taken in the plane of the line A-A of Fig. 1, looking in the direction of the arrows.

The hammer drill cylinder is denoted by.

, 4 is rigidly secured to the front end of the cylinder 1, as, for instance, by being screwed thereon and locked against movement by a- 'clamp rin 5. Y The drill steel receiving chuck is denoted by 6, which chuck extends inwardly through the outer end of the front head 4 and it is locked to the front head by any suitable means, such, forinstance, as by a cross pin 7 4The socket 8 in the chuck for the drill steel extends entirely through the chuck and opens into a pressure fluid feeding .chamber 9 within a tube 10 interposed between the front end of the cylinder 1 and an :inner shoulder -11 of the front head located a sh t distance beyond the inner end of the chuck 6.

under pressure toa hollow drill and its shank 13 extends rearwardly through the tube 10 and reduced front end 14 of the'cylinder 1 into the chamber 3 in position to be struck byl the hammer piston 2. This tube 10 isprovided with an interior annular rib 15 which forms a shoulder against which the inner end of the head 12 of the anvil block abuts.

The front head 4 is provided with a transverseV hole 16 in alinement with a transverse `hole 17 in the tube 10 for permitting the attachment of a pressure iuid supply pipe 18 lfor feeding 'the pressure fluid to thev cham- The'head 12 of the anvil block is provided with an axially arranged duct 19 opening through its front end 'in alinement with the bore 2O of the hollow-drill steel 21, which duct 19 is in vopen communication with the chamber 9 at all times through a branch duct y22.

A cupwasher 23 is interposed between 'the' tube 10 and the inner end of the chuck 6 to form a fluid tight packing at this point, the circumferential flange 24 of which washer is seated in an annular recess 25 in the front end of the tube 10. A cup .washer 26 is interposed between the tube 10 and the shank 13 of the anvil block to form a fluid tight packing at this point, the circumferential flange 27 of which washer being seated in anvannular recess 28 in the inner end of the tube 10.

A fluid tight packing is formed between the drill steel and its chuck at the outer end of the chuck, as followsz-An elastic cup shaped washer 29 has a normally contracted bore of the saine cross sectional shape asthe drill steel and the socket of the chuck, the circumferential"flange, `3() of which cup washer is secured to :'lrigid protecting ring 31, which protectingring is provided with a iaringbore 32 of the same cross sectionai for the recneption of the\ drill steel.

It will be 'seen .that by providing a con- Patented Nov. 15, 1910.

pressure liuid'fceding chamber 9 is rendered fluid tight and also that a fluid tight connection is provided between the drill steel and its chuck. Furthermord-it will be seen mouth of the chuck with a protecting ring of rigid material, it will beseen that the washer v is protected from injury when the drill steel is insertedinto the chuck. y

The packing shown and describedbut not claimed specilically herein, forms the subjectmatter of a copending application led by in'e June 15,1909, Serial N0. 502254.

'-lVhatI claim is t l.- In a'hainmer drill, a front head having apressure lu'idfchamber therein, a chuck se* ,curedtothe front head, a hollow drill steel in open communication with said chamber, an elastic washer seated in the chuck forming a fluid-tight joint around the drill steel and a. washer forming a fluid-tight joint around the chuck.

Q. In a hammer drill, a front head having a pressure fluid chamber therein, a chuck se- Icured to the front head,` an anvil block, a ,hollow drillsteel in open conn'n'unicationwith said chamber and washers forming fluid-tight joints around the chuck and the anvil block.

3. In a hammer drill, a front head havingl a pressure fluid chamber therein, a chuck se cured to the front head, an anvil block, .a hollow .drill steel in. open communication with said chamber, washers forming {inidtight joints around the chuck and the anvil block, and an elastic washer seated in the chuck forming a fluid-tight joint around the drill steel. y

LL l'n a hammer d rill, a tube having a pressure luid feeding chamber therein, a front head inclosing the tube, a chuck se cured tothe fronthead'and having its rear end ertended into said chamber, a'washer forming a -fluid tight joint between the chuck and the front end of the tube, an anvil block, .aY washer forming a fluid-tight joint between the anvil block and the inner end of the tube and a hollow drill steel in open communication withsaid chamber.

5. In a hammer drill, a. tube having a.

pressure luid feeding chamber therein, a front head inclosing the tube, a chucksecured to the front head and having its rear end extended into said chamber, a washer forming a iiuidtight joint between the chuck and the'front en'd of the tube, Aan anvil block,` a washer forming a fluid-tight joint between the-anvil block andthe inner end of the tube, a hollow drill steel in open communication with lsaidA chamber, and an elastic washer seated in the front end of the chuck forming a vHuid-tight joint around the drill steel. Y

In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two witnesses, this thirteenth day of February, 1909,.

' WILLIAM PRELLIVITZ.

F. GEORGE BARRY, HENRY THIEME. 

